List of all necessary common textures

In general common textures you find textures which you have to lay on brushes sothat they can initiate different effects when you are walking through, on or against them. More details below:

If you place a brush with this texture directly into a door and it is closed, all details behind the door won't be shown until it will be opened by the player. So it will raise the performance.

This one is also for raising the perfomance. All faces of a brush overlayed by this texture won't be drawn by the engine. So you should always lay this texture on faces you won't see anyway during play.

If you have a brush with this texture on it, the player won't be able to go through it. So it blocks players.

Putting this one on a brush will prevent a player from getting damage when he falls off a higher distance on the floor.

Recommendable for using to reach better perfomance. I explain that in another tutorial.

In your editor it is only a black texture with the name mirror1. If you place a misc_portal_surface in front of a brush with this texture it will lead to a nice working mirror.

A non-solid texture. You can use it for any liquid so a certain bug doesn't occure, or for fire.

Placing this texture on a brush near a floor will let weapons and gibs fall through it. It is often used in space maps like q3dm17 on the ground so the entities don't keep lying around.

Necessary as an origin point for func_plat, func_rotating, func_bobbing, func_train, func_pendulum.

This texture will let the player slide around until he reaches a floor without it.

Required for any kind of trigger. More details in the teleporter and jumppad tutorial.